Fed Funds Futures Price and Implied Rate
Learn how a 30-Day Fed Funds futures price implies a monthly EFFR average, why it is not realized EFFR, and how meeting months affect interpretation.
Direct answer
For a named 30-Day Fed Funds futures month, the contract's rate expression is 100 minus its quoted price. That number expresses the market's monthly-average EFFR convention for the contract; before expiry it is not the realized EFFR, a single day's rate, an FOMC target range, or a meeting-outcome probability.
Start with the named month and price field
The formula only becomes meaningful after the contract month-year and price field are identified. CME's rulebook defines a 30-Day Federal Funds contract by its delivery month, while a platform can show a last trade, bid, ask, settlement, indicative value, or another timestamped field.
Write the product, month, price field, source, and observation time before converting a price to a rate expression. What 30-Day Fed Funds futures are explains why that monthly identity comes before a broad phrase such as “the Fed Funds price.”
The 100-minus-rate convention yields a monthly average expression
The CME rulebook quotes the contract-grade index as 100 minus the average rate during the contract's delivery month. For a stated price field, the inverse is:
Implied monthly average rate = 100 − named-contract price
The resulting rate is in percentage-point terms under the product's convention. It does not turn the price into a daily realization or prove that every day in the delivery month will have the same EFFR. The average is a named-period quantity, so its scope must stay attached to the result.
Before expiry, a price is not realized monthly EFFR
The New York Fed publishes EFFR for the prior business day's overnight federal funds transactions. That published daily record is not interchangeable with a futures price for a future or incomplete delivery month. CME's FedWatch methodology likewise describes each 30-Day Fed Funds futures price as incorporating market expectations of average daily EFFR in its contract month.
When the delivery month is incomplete, distinguish a live or settlement price from the realized inputs available so far. Fed Funds futures final settlement explains when the completed monthly record becomes the contract's final settlement result.
A meeting month needs a calendar before it becomes a policy estimate
An FOMC meeting can occur inside a contract month, but the contract's convention still concerns the month's average daily EFFR. A price alone does not show how many rate-observation days fall before or after a meeting, or which stated assumptions convert a monthly average into possible target-rate outcomes.
CME's FedWatch methodology uses the meeting schedule, non-meeting-month anchors, and assumptions about target-rate moves to create a probability model. How CME FedWatch probabilities work explains that additional path rather than treating the 100-minus calculation as a stand-alone policy forecast.
Keep price, rate, target, and probability as separate records
A clear rate-futures note can name four different things: the futures price and timestamp, the implied monthly-average rate expression, the New York Fed's daily EFFR publication, and an FOMC target-rate probability model. Similar rate words do not make these data fields interchangeable.
CME FedWatch versus the FOMC dot plot adds another distinction: a market-price model and policymakers' published projections are not the same source. Settlement price versus last trade helps when the question is which futures price field was actually used.
This guide explains a quotation convention. It does not calculate a current implied rate, recommend a futures position, predict EFFR, or predict an FOMC decision. Current exchange rules, prices, and account terms matter in practice.
Common questions
How do I convert a Fed Funds futures price to an implied rate?
For the named 30-Day Fed Funds contract, subtract the stated price from 100. Retain the contract month, price field, source, and observation time with the result.
Is the implied rate the same as today's EFFR?
No. Today's published EFFR is a daily reference-rate record. The futures calculation expresses the named delivery month's average-rate convention.
Does a lower futures price mean a higher implied rate?
Under the 100-minus-rate convention, yes for the same named contract and price field. That arithmetic relationship does not predict a policy decision or a realized account result.
Can I use the calculation to read an FOMC meeting outcome directly?
No. A meeting month includes a monthly average, so a probability interpretation needs meeting timing and a stated methodology in addition to the price.
Is final settlement calculated from the last traded price?
No. The rulebook defines final settlement from the completed delivery month's applicable EFFR record, not merely from the last trade displayed on a screen.